Final answer:
Head locks and spring washers are commonly used in mechanical engineering applications to prevent the loosening of fasteners under external forces.
Step-by-step explanation:
Head locks and spring washers are commonly used in mechanical engineering applications.
Head locks are devices that prevent the loosening of fasteners, such as bolts and screws, by adding mechanical resistance to their rotation. They are typically used in situations where vibrations or other external forces may cause the fasteners to come loose. A common example is the use of head locks in automotive engines to ensure that bolts stay securely fastened, even in high-vibration environments.
Spring washers, on the other hand, are used to prevent the loosening of fasteners due to the effect of external forces, such as vibrations. They are designed to create tension between the fastener and the mating surface, thus preventing rotational movement and maintaining the integrity of the joint. Spring washers are commonly used in various engineering applications, including machinery, construction, and manufacturing.